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HD 18573


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Interdependence of the 4430 A diffuse interstellar band, polarization, and ultraviolet extinction
Central intensities of the 4430-A diffuse interstellar band (DIB) areobtained from reticon spectra of 128 early-type stars, and stars in thePerseus OB1 association are found to have higher ratios of polarizationand weaker 4430-A intensities than do the stars in Cepheus OB3. Thecorrelation noted for OB1 between the A(4430) residuals and E(15-18) canbe explained if the 4430-A DIB arises in a thin grain mantle and the2200-A feature arises in the grain core. The absence of a 4430-A DIB inhigh-Galactic-latitude clouds would then be due to a lack of mantle. TheDIB ratio 5780/5797 A is found to resemble the behavior of the(4430-A)/E(B-V) ratio for seven stars from a range of Galacticlatitudes, confirming the existence of three previously identifiedfamilies of DIBs.

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Observation and Astrometry data

Constellation:Éridan
Right ascension:02h58m55.61s
Declination:-10°56'57.9"
Apparent magnitude:9.139
Proper motion RA:145.9
Proper motion Dec:60.7
B-T magnitude:9.909
V-T magnitude:9.203

Catalogs and designations:
Proper Names
HD 1989HD 18573
TYCHO-2 2000TYC 5290-536-1
USNO-A2.0USNO-A2 0750-00669698
HIPHIP 13896

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